There are few better ways to practice problem solving than competing in a puzzle hunt, and few better ways to exercise some creativity than writing an interesting puzzle.  I helped CMU KGB and later PuzzlehuntCMU make puzzles and run puzzle hunts for several years; here are the puzzles that have made it to hunts (all puzzles solve to a one-phrase answer):

Word Squares  | Solution | (Crossword-esque puzzle from Spring 2012)
Squid Symbols | Solution | (Logic puzzle from Fall 2012)
After the Storm| Solution | (Wordplay puzzle from Fall 2012)
Rock You Like a Hurricane| Solution | (Music puzzle from Fall 2012) 
Hazardous Weather           | Solution | (Weather wordplay puzzle from Fall 2012)
An Adjective is Worth a Thousand Words | Solution | (Wordplay puzzle from Spring 2013)
Musical Intersection | Solution | (Music mashup puzzle from Spring 2013)
The Preposterous Hijinks of Mr. Emu | Solution | (Bird wordplay puzzle from Spring 2013)
Weather in March     | Solution | (Puzzle from Fall 2013)
Product Placement   | Solution | (Product wordplay puzzle from Fall 2013)
Pokemon Concerto  | Solution | (Pokemon music puzzle from Fall 2013)
In Space, No One Can Hear You Rock Out | Solution | (Pop culture puzzle from Spring 2015)
Unhelpful Indices | Solution | (Wordplay puzzle from Spring 2015, no one solved this at the hunt so you could be the first!)
Lost Languages (Language translation puzzle freshly released in Spring 2019)

In November 2019, I launched a Kickstarter for my light drafting card game, Mint Condition Comics, published by neat games.  You can read more about it here: http://www.playneatgames.com/  It came out in August/September 2020, and has a BoardGameGeek entry here: https://boardgamegeek.com/boardgame/290468/mint-condition-comics